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50
45
TRN high noise
TST high noise
TRN medium noise
TST medium noise
TRN low noise
TST low noise
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30
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20
15
10
5
0
5
10
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iteration
Fig. 9.26. Reconstruction error over time for the reconstruction from a sequence of degraded
MNIST digits. Performance for the training set (TRN) and the test set (TST) is very similar.
The error drops fast in the first iterations and stabilizes later. Higher noise levels cause higher
reconstruction errors.
(a) 1 2 4 7 11 16 (b) 1 2 4 7 11 16 (c)
Fig. 9.27. Reconstruction from a sequence of degraded MNIST images (medium noise): (a)
input over time; (b) output over time; (c) target.
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